涡流发生器周向相对位置和高度对高负荷风扇性能的影响

Effects of Circumferential Position and Height of Vortex Generator on Performance of High-Load Fan

关键词:  涡流发生器  高负荷风扇  角区分离  周向相对位置  高度

Key words:  Vortex generator  High-load fan  Corner separation  Circumferential position  Height

摘要:

为了研究涡流发生器周向相对位置和高度对高负荷风扇性能的影响，根据风扇的流动特点，设计了在第二级静子叶根入口前加涡流发生器的流动控制方案，并以此为基础提出了多种不同周向位置和高度的涡流发生器方案，通过计算对采取各种方案下的流场进行了分析。研究表明，涡流发生器对风扇第二级静子角区气流分离有较好的控制作用；涡流发生器的周向位置对第二级静子角区气流分离和损失的影响较大，采取方案C时可以更好地抑制角区气流分离，减少局部损失；涡流发生器高度过高会使静子压力面出现不同程度的低速区，同时也会引起静子通道内局部损失增加，在所研究的范围内，当涡流发生器高度降低1%叶高时，其对吸力面角区分离的控制效果更加明显。

Abstract:

In order to study effects of the circumferential position and height of vortex generator on performance of high-load fan， the VG flow control programs before the root of the second stator were designed based on the feature of the fan flow. Different circumferential position and height VG programs were presented and the changes of fan aerodynamic performance and flow structure resulted from different VG programs were simulated. The results show that the corner separation of the second stator was suppressed by VG. The circumferential position of VG strongly influences the corner separation and flow loss of the second stator， while configuration C has the best effects. If the VG was too high， low-speed areas would appear near the pressure surface， while the flow loss in the channel of the second stator would increase， and the control program would have the best effects when the height of VG decrease 1% span within the limits of our study.